package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前的购物车是否存在菜品和套餐
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size() > 0){
            //如果存在，数量加1
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);

        }else {
            //如果没有存在，需要加入一条新的购车数据

            //判断本次添加的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                //本次添加的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage((dish.getImage()));
                shoppingCart.setAmount(dish.getPrice());
                /*shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(LocalDateTime.now());*/
            }else{
                //本次添加的是套餐
                Long setmealId = shoppingCart.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage((setmeal.getImage()));
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.clean(userId);
    }

    /**
     * 删除购物车中的一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void removeShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //查询到购物车中的商品，获取到商品的数量
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        ShoppingCart cart = list.get(0);

        Long dishId = cart.getDishId();
        if (dishId != null){
            //本次删除的是菜品
            if (cart.getNumber() > 1){
                cart.setNumber(cart.getNumber()-1);
                shoppingCartMapper.updateNumberById(cart);
            }else {
                shoppingCartMapper.delete(cart);
            }
        }else{
            //本次删除的是套餐
            if (cart.getNumber() > 1){
                cart.setNumber(cart.getNumber()-1);
                shoppingCartMapper.updateNumberById(cart);
            }else {
                shoppingCartMapper.delete(cart);
            }
        }
    }
}
